/*
 * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under both the BSD-style license (found in the
 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
 * in the COPYING file in the root directory of this source tree).
 * You may select, at your option, one of the above-listed licenses.
 */

/*-*************************************
 *  Dependencies
 ***************************************/
#include <stdlib.h> /* malloc, calloc, free */
#include <string.h> /* memset */

#include "error_private.h"
#include "zstd_internal.h"

/*-****************************************
 *  Version
 ******************************************/
unsigned ZSTD_versionNumber(void) {
    return ZSTD_VERSION_NUMBER;
}

const char* ZSTD_versionString(void) {
    return ZSTD_VERSION_STRING;
}

/*-****************************************
 *  ZSTD Error Management
 ******************************************/
#undef ZSTD_isError /* defined within zstd_internal.h */
/*! ZSTD_isError() :
 *  tells if a return value is an error code
 *  symbol is required for external callers */
unsigned ZSTD_isError(size_t code) {
    return ERR_isError(code);
}

/*! ZSTD_getErrorName() :
 *  provides error code string from function result (useful for debugging) */
const char* ZSTD_getErrorName(size_t code) {
    return ERR_getErrorName(code);
}

/*! ZSTD_getError() :
 *  convert a `size_t` function result into a proper ZSTD_errorCode enum */
ZSTD_ErrorCode ZSTD_getErrorCode(size_t code) {
    return ERR_getErrorCode(code);
}

/*! ZSTD_getErrorString() :
 *  provides error code string from enum */
const char* ZSTD_getErrorString(ZSTD_ErrorCode code) {
    return ERR_getErrorString(code);
}

/*=**************************************************************
 *  Custom allocator
 ****************************************************************/
void* ZSTD_malloc(size_t size, ZSTD_customMem customMem) {
    if (customMem.customAlloc)
        return customMem.customAlloc(customMem.opaque, size);
    return malloc(size);
}

void* ZSTD_calloc(size_t size, ZSTD_customMem customMem) {
    if (customMem.customAlloc) {
        /* calloc implemented as malloc+memset;
         * not as efficient as calloc, but next best guess for custom malloc */
        void* const ptr = customMem.customAlloc(customMem.opaque, size);
        memset(ptr, 0, size);
        return ptr;
    }
    return calloc(1, size);
}

void ZSTD_free(void* ptr, ZSTD_customMem customMem) {
    if (ptr != NULL) {
        if (customMem.customFree)
            customMem.customFree(customMem.opaque, ptr);
        else
            free(ptr);
    }
}
